Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67c90e646a030502be4ad6ec0ac203dd379420fc1496fa9fd770e697fb0e0cc' 
  AND token = 'uk3iQCERIHANURQb1PdqTCz3UcfxZEo4AOtH27pruec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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