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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052adc03ac4545f7aec85ace91c6682449cd3d04d3b1091ca454b7c8d75b1e7d' 
  AND token = 'nQ78iuzWXm0kC4jXdqmdt15FijgcoZ6DbgfT8HaVjZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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