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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb920d37872400da36469338ad6d9ee977f178c544282f9bc7fd716c9957273' 
  AND token = 'r5bjIZu8CJJ8Y5ECd57TuJxUf5jOcwWiQVuBNIk/l5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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