SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009d713a0bb054d0efab2f938f0f3759baa1d3b143b3b0234621a45300a8f167' 
  AND token = 'kYVx8ivAEiwQYzCJbxAl+Z69fDiVNU4UJZvFj8x8Xhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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