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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '053d097f8153d6d7d1fb69a7ce16ff0d366a918e4dc589cc16d47a10adb2de40' 
  AND token = 'EU6aXeYXk3rc4H/IFMPWSU7Sebn9L/zswtJI+t6LwLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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