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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d93c8d7e0df42115b312f38315f352791b814806fa222f5b8010dc5b82c7469' 
  AND token = 'CB6A36/3sHZVUXYVtdOpo3a37m5H+PWpHne03fUVDjo=' 
  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"
    }
  }
}