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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4fbff1cf82e979f61c590f88a8f52285afc17fce480a9f56eadba705f49fc4e' 
  AND token = 'QcJK7sd+AZoa2IfU77lD1oPP9BxrWAI1S/xqCHK55C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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