SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a6799aab3df62fc9b97d7b261db2acc1ec5de3c4636b2d7cf62c6446f67cad' 
  AND token = 'UYny81MRMTZwDnSqwVG9pfiOU/PFJ8JQ+rNc5JbztKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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