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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f18246df309fb6ef5aa7c19644bb3d2711ab892eb434d841c9f37c79a682a86' 
  AND token = 'UgMUJ4xgZaV6W05Py63/2xjVM6UlRf5U11r2Rq2IHt0=' 
  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"
    }
  }
}