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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af3f38b08c1cf0587471806c8c63729838d11e3e4accc15cecba1be20a73ac77' 
  AND token = 'hOUgIQW9EkV4YWPRMw2nrPhtlbl3ocE43Uq9hnIN9HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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