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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fdf26a9b63e0b4cd313aff28146f3e929ae91f63ab65f274f3cf1df52a0f427' 
  AND token = '0GQdfSrBFxdZSy5Uu4z3vCxlL8WURD5goFQ0L8Wn/YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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