Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10717e4c3611fb08ce8c8b8ecf8a96bec13aac270417f34052271168e1e6b7f' 
  AND token = 'OE8AQ58UdeuavRt2U2tTX6NNBTizDU+uRk2lsKS6cgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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