SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2290b6e14eca248720b12163b5fbb4e319c380ad651367fe1a5c9234233d14c7' 
  AND token = 'DnHQXtxMD6Zsgqd9LxrWDv5FMP+0+jKzG4RsejBu3l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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