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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae09693f237f4f6e96b6d15c92ceff24b2e0d4c0c598b38ffd68a3b4aabd0809' 
  AND token = 'FmeiGPZxeHgU2kBXdoyEOUrnwSLJyOcBs86H080Lwos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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