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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '436758c4d8b3d2ae0698be34d7a1648d090540d4c678d7baa0c13d08762726b9' 
  AND token = 'XXkbZYTvy3XkJUcxw4sIxCbN9Q8d6NFIZQJvr0qzRyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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