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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '159a05dc67c7bbb61181344f63e59a664a4394fa641a518dc5b4f562f0305892' 
  AND token = '2WSNWjhEZoXHyGrgrUAk3a6F175RtenywgHe0die4TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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