Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4df597f71351dc30508810f9482e8a1cd2baedb3e7fd54aa218ee05e0f7d0b' 
  AND token = '+jIrQaF3PMbTtjiNT8lxuupSPFGNIxgvILu68VtHBtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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