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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa9274c5b34f4e7fcc0c1f8f18fe0dcfefe6cc55de53f71d02dec04a1b36955' 
  AND token = 'J6qbd+PXeG0BeKaRg710ykejFgk6DrMOB38WjWvnzC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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