SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dad678b0353b7d25156f5358ce1c2cb2163cca02edf04cf83dbf54ecef11966' 
  AND token = 'JCImtLsYPSXu+lZgZ+o8Cbgb79XbwO2WOUytK4BwHsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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