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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28485e23f598c37c923ef6eb4fceea4cc01126efae3148a4e051b8848f8d8196' 
  AND token = 'YLsnNJZCp8OFX2Fefvc3TmvB0qIw6LYIWe3Orm58GCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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