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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9626feb49393c8bc857e26b874f24075ef483840ddf423a19e0c457baca3fbe9' 
  AND token = 'vt4nemWqYB3K3s4mQYUW2bfanGJUSSnX3/4HSeXCT5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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