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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea360247f1dedde2ed87fa6e6a2d999e54d406fcfc035ae24ad792809851177' 
  AND token = '24aAPAKeoIAX6wUKpv16aP5kw0OLGoigvmVZWnFlX8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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