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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d8896d8bdf00e3f8c5790f7ecf4c475bc4b00f14bdb72d3c90ef17b58f7a59' 
  AND token = 'VXJ5gI8NhHuubUu4N2ITYHgmfX/e5dy2WJ/aTbKuTaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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