Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702022f4bcf9cc1aefd7aa5b14b6a126d78c8369840ee54efd3f36f8d60fe83f' 
  AND token = 'b2GYaMOFrmmb0fJmjNNQXmVYMbH4hYPvHQ6i1UBuROs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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