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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b040cb5ba312dd499c5a9f016662f1b34fbe67cd8d284242c0497345799dc5' 
  AND token = 'o8bOL8V6pVaIXJbOyW7z7/SBTcDFypDniw0Tt+dJ+MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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