Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a7f34b9e95e578aa2f804492c5cf911b821f67c6cc318a4e8c9698d78c776a' 
  AND token = 'lmPJi8LkePSYo0/IIDYY7jJZbr3f5kWoaFYLJxuXcsk=' 
  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"
    }
  }
}