Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca33ed0981f5ab5497364c76a4e2907652db8ec5d0bf4d0968cf5ceccb5f0c0b' 
  AND token = 'x/TPapp48Ai4/QAJant+rCHZKOWdmyvWb5TS6osZvHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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