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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6058b30d8e348b64b23c6bf39777a96ec984e5c5e3b04d0c88bce5853d2c60d7' 
  AND token = 'r9PxKI/Inthr+ezEOdRAr70BjjnRPuOqagLC2DREuAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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