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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1747c76b7c965f55d222e2c19b4b64065975cde77e6e3ccb5ce91a4584b82a5' 
  AND token = 'GNLSiOOeB97R0eDB1knfmiPEhta93+7an4AxrevuT08=' 
  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"
    }
  }
}