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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f6f60e19eb2fce35775b522b164ec7748960b52a1b082adeb715cf5a7cf2df' 
  AND token = '6Xujp46l1I0UT9l1WfLIp+7yehiNSexz/3LCe5fJ80c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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