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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d94bfcea5e60c1fb51479ba68f84673fdee09aa4d37d52c4c8827b297a02d0' 
  AND token = 'YtbFcZcmfjfh5mH4XxHaA9yDWPgVhv0g41Ag7Zto1tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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