Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1dcf9adc5f8bded50ae8abf4494865cd68383ac36ce67a95b266f5c1c221b7' 
  AND token = 'ktXdWLVC5vOWN9ihAFbBtJ29ZOYbDkTxAVIr1XnvqcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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