Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5e8cbec113849f7270f42d5c1efcd8939556cdfcadd046c7bf07abe0e0cf32' 
  AND token = '5vHnEeUpWCBTfphY+ewwNW0xaJNEwPi9sGD7Coa3eus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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