Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '714df2c75a0ad7b1ed48f964c3cd936957e040810848d987466222d5009610fa' 
  AND token = '7YVVD93NIDfPhfUm5M87lrCZzXzoR4dOIz2xhDYhiww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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