SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f7ece8fc46c5c207dd4231aeb186f9eaf6c476f1a2aadf11b81244b84050ed' 
  AND token = '5xv4QBWKwoAZaXUqtGMl6wQ+JmZ3iw3HGj2RK7MsJy8=' 
  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"
    }
  }
}