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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c5543a95e7550bb74f34e119ffe67aeead91628cd98f16dd933be99301289de' 
  AND token = 'Mi+JhY3V6th4sisT30vCR7pWY8uR46vcvfI0qWNCrJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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