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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684e906d572e243a9e025f97d7c2b7ac899d03154f1cf80fd77ad23623803700' 
  AND token = '9l9Y75d/2ARBpkt0VUX3wIWnVi6uswA1qNHljk6TPZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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