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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48cba1ff9bed8d98cf1b5b06de1fb831be091ecabcb9fe2c4c487847c4a4fa1' 
  AND token = 'ClkbtpgCE+8qRBv3iVK0lLdsVqxZ0jC2UHUERSRYAR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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