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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101bfd41ab9c721c9b0db1ddd8cfa4dff1266b734fb49e74e877f2aa020fadc4' 
  AND token = '+mhnkiV/PRsPWXkjT9tsGwv1KS60b8XYi+r2xs028fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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