Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44870b454151c0d6fca62dabd7ebad67d8be7896f1e934f816905d87835d2cc1' 
  AND token = 'At80a63QIxp4Eo2LhUZvOosjVPWlzEMbOFMHvFOPG8w=' 
  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"
    }
  }
}