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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1431e664294caf7c0c41d6c8ba255054d6ea0f6a8ece04f72e56a6f87d5e5395' 
  AND token = 'UT6SJy/H1jffrVUUFubWIoOdIm9DR14hjKdPD2mr3iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}