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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038fd619a15d3c188b80187543cc313618685cd87d90f1bd59e3a5587f73fbb9' 
  AND token = '2tf2waddDIjlK9OmBauienNu83eG/w8CckPRx4zZVCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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