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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21ab26b616aebd8e0bcc1c60c803b1722cf9070c01a2d3cf621fe4c03505f515' 
  AND token = 'aa8ZmD5ZLaAs5/uzcDNGborv7a1zz6iE1YIFMG2KTmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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