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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd7e968724f577dccb9b98f4bab286bdda62ee420d7d8b181177183fba7c3ed2' 
  AND token = 'ZPrXiURuEtfV3Zzv/8ZJQu0i9dDRN+p1X7seTYslLkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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