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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe756b63d62b82cb54d00a042d7c1959e0da9a51b77bc642409a12d6f2f7c73' 
  AND token = 'gJwMsLrsVrE3zqVX5QUG8Iq1QLoGb5aaVi45RxGhG8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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