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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d91b833704fda99e93d0a4d32668605d4f608d52662f39f9c89a24ff95b2e2' 
  AND token = 'n90WGkgDkk/vaRmq5ruNp0OSmofUZfa4eo2+XpBXT1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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