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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '256fb98544e54a509a5667118bba7151e887cd87de4a463c694ded2636a93e42' 
  AND token = 'esLcPNuLUWG1dEpvFBzz62P1ch/MFJtSJxjuyMAw42k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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