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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9e2ff0e9be551520e2cf33439e52a2971221b523fde3f4a0e8f3e5822d6148' 
  AND token = '0i1gYtTDCnnp87TMPghbD7LJdHYmzuD3avFU0Jsz9Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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