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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62aa5b67e5d83d59d5fed0ca460ca00de19a5477f4f758442046b101940b41b5' 
  AND token = 'VnZOQOZPLpLwcAvoVJTY+gkWNYL/Rs7D13hR565ixDg=' 
  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"
    }
  }
}