Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5bf37166e497f507a64aa607bcef0b46e4b8eaf9b8387cda4778c0128109f69' 
  AND token = 'CbU6dKK1UElfh76x1uXEIm0bwd6qsJ243biG/rDUpPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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