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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d4fe8a96a9307ed96139c7e3962c3e2bd56cd5e33a9ac8ca0374fe2911e213a' 
  AND token = 'oUYkGo8tsFNphYUgyap2JSZo2kQrcJncArNLJLOg2HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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