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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1223567206321a5a5ad019dfe446478416210582f433231c8b9dd7ff9b192fb' 
  AND token = 'N8Hd9Xrz0Fu9Yxy+n1yW48p1uji6ZMgkyrsHBI3pR4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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