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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '210580a2a2589e62eb9bc1228ec3fc39cbbd0945556b240b5a5d4a1eb8464152' 
  AND token = 'TeZzM5Xx3tRoqenVcJk4Q3Gjj6zG+/M67kJY99GFyDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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