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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c920c2f8bdc96f2d9f36735ecc52ff0370503f8035d7a4138dfe08f0aeb94c' 
  AND token = '02M9wFxSMw78MeKgDC27qLjIO90l36KtuwzlAvoA3w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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