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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fb3cd506d44ba69192083d1dd2bc0c01911e46fa03673b8de99b09f2562d55d' 
  AND token = 'aRQrUZKSQ3Xv6vhnbrnYtKLEknAC7u0KozFuLsBY4l8=' 
  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"
    }
  }
}