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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131f3269ac79d52149695b6624ee5b7948944d2ae420051f24690ac70b3de66f' 
  AND token = '6qySdJr3Nsq+F6MPIuBZu5mFd47zX1Lf/Mo1cDMNB3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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