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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9313d3fef0dcdd3231b54f94e18e3cc21da8c13ecb5f245701e36fbfd257500' 
  AND token = 'qze7JQsrhDBcdC23gvedzJBvbRIHdS+15I4Y9Qg334E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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