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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976d98fcd5bb6da68d84ccfee68034fc050ed204d7a88f2782cc6cedd0951b27' 
  AND token = 'B8u54zUo4VH8IYZ7qZ1OcUH1oAvPyjfE+AZdGZDzJpc=' 
  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"
    }
  }
}