SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f444ee31634cfd77c82f7ed668dc96902a1222d392257d804b29cf92149f406' 
  AND token = 'fs1WhvBt2PbWuJKpeD+cmqBP3hYZoG7dwKhXdiVs/f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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